CN213076099U

CN213076099U - Acetabular cup

Info

Publication number: CN213076099U
Application number: CN202021119520.1U
Authority: CN
Inventors: 郭谦; 聂永嘉; 王东
Original assignee: Beijing Keyi Bangen Medical Devices Technology Co ltd
Current assignee: Beijing Keyi Bangen Medical Devices Technology Co ltd
Priority date: 2020-06-18
Filing date: 2020-06-18
Publication date: 2021-04-30
Anticipated expiration: 2030-06-18

Abstract

The application provides an acetabular cup, and relates to the field of orthopedic implants. The acetabular cup includes a metal base and a trabecular bone-like outer layer. The metal base has an inner concave surface and an outer convex surface which are arranged oppositely, and the inner concave surface is used for contacting with an acetabulum lining or a femoral ball head. The outer layer of the bone-like trabecula is arranged on the surface of the outer convex surface and is used for contacting with the native bone of the human body; the outer layer of the bone-like trabecula is a metal titanium layer with a porous structure, the pores of the metal titanium layer are mutually communicated, the porosity of the metal titanium layer is 86-90%, the surface roughness is 2-9 microns, and the pore diameter of the metal titanium layer is 350-650 microns. It can improve the function of fusion with host bone tissue and improve the interface stability between the artificial prosthesis and the host bone tissue.

Description

Acetabular cup

Technical Field

The application relates to the field of orthopedic implants, in particular to an acetabular cup.

Background

The conventional acetabular cup is a hemisphere, and coatings which can enable bone to be combined more firmly, such as sand blasting, hydroxyapatite and the like, are usually sprayed on the outer surface of the conventional acetabular cup, but the coatings are difficult to enable the bone to grow into the coatings, so that the binding force of the coatings only stays on the surface, a good biological fixation effect cannot be achieved, and the initial stability cannot be achieved.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an acetabular cup, which can improve the function of fusion with host bone tissues and improve the interface stability between an artificial prosthesis and the host bone tissues.

The embodiment of the application is realized as follows:

an embodiment of the present application provides an acetabular cup, including: a metal substrate and an outer layer of a trabecular bone-like structure;

the metal base is provided with an inner concave surface and an outer convex surface which are oppositely arranged, and the inner concave surface is used for being contacted with an acetabulum lining or a femoral ball head;

the outer layer of the bone-like trabecula is arranged on the surface of the outer convex surface and is used for contacting with the native bone of the human body; the outer layer of the bone-like trabecula is a metal titanium layer with a porous structure, the pores of the metal titanium layer are mutually communicated, the porosity of the metal titanium layer is 86-90%, the surface roughness is 2-9 microns, and the pore diameter of the metal titanium layer is 350-650 microns.

In the technical scheme, the outer layer of the bone-like trabecula is mainly used for contacting with the native bone of a human body, and the metal titanium layer has good biocompatibility. In addition, the pores of the titanium metal layer are mutually communicated, so that moisture and nutrient substances can be transmitted in the acetabular cup through the pores, the bone tissue can be promoted to grow inwards to form biological fixation, the aim of fusing the acetabular cup and the host bone tissue is fulfilled, the early-stage load capacity is improved, and the interface stability between the acetabular cup and the host bone tissue is improved.

In one possible embodiment, the thickness of the metallic titanium layer is greater than 1.5 mm.

In the technical scheme, after the bone tissue of the human body completely grows into the metal titanium layer of the acetabular cup, the metal titanium layer with the thickness larger than 1.5mm can ensure that the interface between the acetabular cup and the host bone has enough bonding strength, effectively improves the long-term stability of the acetabular cup in the body and enables the acetabular cup and the host bone tissue to realize deep fusion.

In one possible embodiment, the thickness of the metallic titanium layer is greater than 1.7 mm.

In the technical scheme, the metal titanium layer with the thickness can better ensure that the acetabular cup and a host bone interface have enough bonding strength, and effectively improve the long-term stability of the acetabular cup in a body.

In one possible embodiment, the metallic titanium layer has a pore depth of 1000 to 1500 μm.

In the technical scheme, the titanium metal layer with the pore depth of 1000-1500 mu m can better promote the bone tissue ingrowth, so that the fusion effect of the acetabular cup and the host bone tissue is improved.

In one possible embodiment, the inter-pore wall thickness between adjacent pores of the metallic titanium layer is 100 to 400 μm.

In the technical scheme, the thickness of the wall between the adjacent pores is 100-400 mu m, and the thickness of the wall between the adjacent pores is proper, so that the sufficient bonding strength between the acetabular cup and the host bone interface can be better ensured.

In one possible embodiment, the surface roughness of the metallic titanium layer is 3 to 5 μm.

In the technical scheme, the applicant researches and discovers that the surface roughness of the titanium metal layer is 3-5 microns under the conditions that the aperture of the titanium metal layer is 350-650 microns and the porosity is 86-90%, the fusion function of the acetabular cup and host bone tissue can be better improved, and the interface stability between the acetabular cup and the host bone tissue is improved.

In a possible embodiment, the lateral cross section of the pore structure of the metallic titanium layer is irregular polygon.

In the technical scheme, after bone tissues grow into the outer layer of the bone-like trabecula of the acetabular cup, the transverse cross section of the hole structure is an irregular polygon, so that the holding power is better, the acetabular cup and host bones can be better fused, and the bonding strength of the acetabular cup and the host bones is improved.

In a possible embodiment, the metal substrate and the outer layer of the bone-like trabecula are correspondingly provided with a plurality of screw holes.

In the technical scheme, the acetabular cup can be better fixed on the human native bone by utilizing other fasteners to be matched with the screw holes.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic structural view of an acetabular cup provided in an embodiment of the present disclosure;

FIG. 2 is a cross-sectional view of an acetabular cup provided by embodiments of the present application.

Icon: 10-acetabular cup; 11-a metal substrate; 111-an inner concave surface; 12-trabecular-like outer layer; 13-screw hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when using, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the term "disposed" is to be understood broadly, for example, as being fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Referring to fig. 1 and 2, an acetabular cup 10 includes a metal base 11 and a trabecular bone-like outer layer 12.

Wherein, the metal base 11 has an inner concave surface 111 and an outer convex surface which are oppositely arranged, and the inner concave surface 111 is used for contacting with an acetabulum lining or a femoral ball head. Illustratively, the metal substrate 11 may be made of stainless steel, titanium alloy, or the like.

The outer layer 12 of the bone-like trabecula is arranged on the surface of the outer convex surface and is used for contacting with the native bone of the human body; the outer layer 12 of the bone-like trabecula is a metal titanium layer with a porous structure, the pores of the metal titanium layer are communicated with each other, the porosity of the metal titanium layer is 86-90%, the surface roughness is 2-9 μm, and the pore diameter of the metal titanium layer is 350-650 μm.

The trabecular bone-like outer layer 12 is mainly used for contacting with the native bone of a human body, the metal titanium layer has good biocompatibility, and the applicant researches and discovers that the porosity of the metal titanium layer is 86-90%, the surface roughness is 2-9 mu m, the aperture of the metal titanium layer is 350-650 mu m, the metal titanium layer is similar to the native bone tissue, and meanwhile, the surface of the metal titanium layer has an infiltration effect, and the functional synthesis of the bone-like tissue in blood is facilitated. In addition, the pores of the titanium metal layer are mutually communicated, so that moisture and nutrient substances can be transmitted in the acetabular cup 10 through the pores, the bone tissue can be promoted to grow inwards to form biological fixation, the aim of fusing the acetabular cup 10 and the host bone tissue is fulfilled, the early-stage load capacity is improved, and the interface stability between the acetabular cup 10 and the host bone tissue is improved.

Illustratively, the porosity of the metallic titanium layer is any one of 86%, 87%, 88%, 89%, and 90%, or a range between any two.

Illustratively, the pore size of the metallic titanium layer is any one of 350 μm, 380 μm, 400 μm, 420 μm, 450 μm, 480 μm, 500 μm, 550 μm, 600 μm, and 650 μm, or a range between any two.

Optionally, the surface roughness of the metallic titanium layer is in a range between any one or any two of 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm and 9 μm.

The applicant researches and discovers that the surface roughness of the titanium metal layer is 3-5 microns under the conditions that the aperture of the titanium metal layer is 350-650 microns and the porosity is 86-90%, the fusion effect of the acetabular cup 10 and host bone tissues can be better improved, and the interface stability between the acetabular cup 10 and the host bone tissues is improved.

It should be noted that, the metallic titanium layer in the embodiment of the present application may be formed by 3D printing of titanium powder. Illustratively, the pore structure of the metallic titanium layer has an irregular polygonal transverse cross-section. The irregular polygonal structure enables the acetabular cup 10 to better fuse with host bone, improving its bond strength. Here, the lateral section refers to a section parallel to the bottom surface of the metal base 11. It is understood that the transverse cross-section of the pore structure of the titanium metal layer may have other shapes, such as a regular shape (e.g., an ellipse, a parallelogram) in a portion and irregular deformation in a portion. The transverse cross section of the pore structure of the titanium metal layer can also be all circular, oval or regular polygon, wherein the polygon refers to a figure with three or more sides, such as triangle, rectangle, etc.

Further, in a possible embodiment, the thickness of the metallic titanium layer is greater than 1.5mm, for example 1.55mm, 1.6mm, 1.7mm, 2mm, 2.5 mm. After the bone tissue of the human body completely grows into the metal titanium layer of the acetabular cup 10, the metal titanium layer with the thickness larger than 1.5mm can ensure that the interface between the acetabular cup 10 and the host bone has enough bonding strength, effectively improve the long-term stability of the acetabular cup 10 in the body and realize deep fusion of the acetabular cup 10 and the host bone tissue.

Illustratively, the thickness of the metallic titanium layer is greater than 1.7 mm. The metal titanium layer with the thickness can better ensure that the acetabulum cup 10 and the host bone interface have enough bonding strength, and effectively improve the long-term stability of the acetabulum cup 10 in vivo.

Further, in a possible embodiment, the pore depth of the metallic titanium layer is 1000 to 1500 μm. The titanium layer with the pore depth of 1000-1500 mu m can better promote the bone tissue ingrowth, so that the fusion effect of the acetabular cup 10 and the host bone tissue is improved. Illustratively, the metallic titanium layer has a pore depth in a range between any one or any two of 1000 μm, 1100 μm, 1200 μm, 1300 μm, 1400 μm, and 1500 μm.

In addition, optionally, the thickness of the inter-hole wall between adjacent pores of the metallic titanium layer is 100-400 μm. The thickness of the wall between the holes is suitable to better ensure that the acetabular cup 10 has sufficient bonding strength with the host bone interface. Illustratively, the inter-pore wall thickness between adjacent pores of the metallic titanium layer is in a range of any one or between any two of 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, and 400 μm.

Furthermore, in order to fix the acetabular cup 10 to the native bone of the human body better, the metal base 11 and the bone-like trabecular outer layer 12 may be provided with a plurality of corresponding screw holes 13. The acetabular cup 10 is better secured to the native bone of the human body using other fasteners (e.g., screws) in cooperation with the plurality of threaded holes 13, thereby facilitating fusion of the acetabular cup 10 with the host bone tissue.

It will be appreciated that in other embodiments, the acetabular cup 10 may be secured to the human native bone in other ways, such as by gluing the acetabular cup 10 to the human native bone.

In summary, the acetabular cup 10 provided in the embodiment of the present application, wherein the metallic titanium layer has good biocompatibility, the applicant finds that the porosity of the metallic titanium layer is 86-90%, the surface roughness is 2-9 μm, the pore diameter of the metallic titanium layer is 350-650 μm, and the metallic titanium layer is similar to native bone tissue, and the surface of the metallic titanium layer has an infiltration effect, which is beneficial to the functional synthesis of bone-like tissue in blood. In addition, the pores of the titanium metal layer are mutually communicated, so that moisture and nutrient substances can be transmitted in the acetabular cup 10 through the pores, the bone tissue can be promoted to grow inwards to form biological fixation, the function of fusing the acetabular cup 10 and the host bone tissue is achieved, the early-stage loading capacity is improved, and the interface stability between the acetabular cup 10 and the host bone tissue is improved.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An acetabular cup, comprising:

the metal base is provided with an inner concave surface and an outer convex surface which are oppositely arranged, and the inner concave surface is used for being in contact with an acetabulum lining or a femoral ball head; and

the outer bone-like trabecular layer is arranged on the surface of the outer convex surface and is used for contacting with the native bone of the human body; the outer layer of the bone-like trabecula is a metal titanium layer with a porous structure, the pores of the metal titanium layer are communicated with one another, the porosity of the metal titanium layer is 86-90%, the surface roughness is 2-9 microns, and the pore diameter of the metal titanium layer is 350-650 microns.

2. The acetabular cup of claim 1 wherein the metallic titanium layer has a thickness greater than 1.5 mm.

3. The acetabular cup of claim 2 wherein the metallic titanium layer has a thickness greater than 1.7 mm.

4. The acetabular cup of claim 2 or 3, wherein the metallic titanium layer has a pore depth of 1000-1500 μm.

5. The acetabular cup of any one of claims 1 to 3, wherein the inter-hole wall thickness between adjacent voids of the metallic titanium layer is 100 to 400 μm.

6. The acetabular cup of any one of claims 1 to 3, wherein the metallic titanium layer has a surface roughness of 3 to 5 μm.

7. The acetabular cup of any one of claims 1-3, wherein the pore structure of the metallic titanium layer is irregular polygonal in lateral cross-section.

8. The acetabular cup of any one of claims 1-3, wherein the metal base and the outer bone-like trabecular layer are each correspondingly provided with a plurality of screw holes.